啮齿类 Traditional form: 囓齒類 Pinyin (reading): nièchǐlèi Definitions: rodents Characters: 啮 - to bite, to gnaw 齿 - teeth; gears, cogs; age 类 - category, class, group, kind; similar to; to resemble Traditional characters: 齒 - teeth; gears, cogs; age 類 - category, class, group, kind; similar to; to resemble